135446-20-7 2,5,6,9-Tetrahydro-6-n-butyl-9-methyl-3H-1,2,4-triazolo(3,4-i)purine-3,5-dione 3H-1,2,4-Triazolo(3,4-i)purine-3,5(2H)-dione, 6,9-dihydro-6-butyl-9-methyl- 6,9-Dihydro-6-butyl-9-methyl-3H-1,2,4-triazolo(3,4-i)purine-3,5(2H)-dione